One of the most butt-clenching games I've played so far! :D At first it felt unfair, but then I got the hang of it. I like how you placed pickups at hard-but-not-impossible-to-reach places. It would've been better if they had a white outline or something else to make them easier to see, though.
The tutorial section is very well-made (not allowing the player to pass through until they used the necessary skills), although when I die, there should be both a [RESTART] button and a [RESTART FROM BEGINNING] one so that I could skip it on my retries. However, I understand that it's quite a bit of work to implement this.
The music is dark and tragic-sounding, which is exactly what I would expect in a game about someone running from their inner demons à la The Onion's Nike video (but not funny) or Siamés's "The Wolf" (but more hopeless).
I think sometimes it failed to register that I wanted to dash, but maybe I had already accidentally made a 0-length dash or something, I'm not sure.
Since platforming is key here, it will be better if the player's vertical speed is divided when they release the Jump key after a jump (but not after a dash). That way, it should become less frustrating when I jump too high and then realize I should have landed lower.
